21221102100004 has 6 divisors (see below), whose sum is σ = 37136928675014. Its totient is φ = 10610551050000.

The previous prime is 21221102099987. The next prime is 21221102100007. The reversal of 21221102100004 is 40000120112212.

It can be written as a sum of positive squares in only one way, i.e., 20611690800100 + 609411299904 = 4540010^2 + 780648^2 .

It is not an unprimeable number, because it can be changed into a prime (21221102100007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652637762497 + ... + 2652637762504.

Almost surely, 2^{21221102100004} is an apocalyptic number.

It is an amenable number.

21221102100004 is a deficient number, since it is larger than the sum of its proper divisors (15915826575010).

21221102100004 is a wasteful number, since it uses less digits than its factorization.

21221102100004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305275525005 (or 5305275525003 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221102100004 its reverse (40000120112212), we get a palindrome (61221222212216).

The spelling of 21221102100004 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, four".